Novel device for testing dust suppression performance of dry-mixed mortar

Abstract

The utility model discloses a novel dry-mixed mortar dust suppression performance testing device, and belongs to the technical field of building material performance testing. The novel device for testing the dust suppression performance of the dry-mixed mortar comprises a vertically arranged fixed plate and a turntable, wherein the turntable rotates on the fixed plate through an arranged rotating part; a test tube made of a transparent material is detachably arranged on the turntable, and a test tube plug is arranged at the opening part of the test tube; at least one test tube clamp is arranged on the rotating disc, a light emitter and a light receiver are fixedly arranged on the fixing plate on the two sides of the test tube respectively, and the light receiver is electrically connected with the photoelectric converter. The dry-mixed mortar falls freely under the action of gravity after being stirred under the simulated actual construction condition, and a judgment index for quantifying the dust suppression characteristic of the dust suppression dry-mixed mortar on the basis of the amount of dust in a suspended state in the falling process is tested, so that the dust suppression performance of the dry-mixed mortar can be evaluated conveniently, quickly and accurately; and the working efficiency of testing is improved.

Description

Technical Field

[0001] This utility model relates to the field of building material performance testing technology, and in particular to a novel dust suppression performance testing device for dry powder mortar. Background Technology

[0002] With the rapid development of my country's economy, the booming construction industry has driven the continuous expansion of the application of dry-mix mortar. However, dry-mix mortar generates a large amount of dust during use. The dust-generating substances in dry-mix mortar are mainly the ultra-fine components of binders and modifiers, characterized by small particle size and relatively low density. Under mechanical vibration or other external forces, dust will be released. Dust generated during the production of dry-mix mortar due to mechanical mixing or scattering during transportation can affect the physical and mental health of production workers and pollute workshop production equipment and the working environment. During use, dust generated when dry-mix mortar is poured into water and mixed can also affect the health of construction workers. Currently, dust suppressants are added to dry-mix mortar to inhibit dust emission and ensure that dust generation is reduced during transportation and use.

[0003] Therefore, testing the dust suppression performance of dry mortar is particularly important. However, traditional testing methods are often time-consuming and labor-intensive, which limits their applicability. Utility Model Content

[0004] This invention provides a novel dust suppression performance testing device for dry mortar, which can conveniently, quickly, and accurately test the dust suppression performance of dry mortar.

[0005] The technical solution provided by this utility model is as follows:

[0006] A novel dust suppression performance testing device for dry powder mortar includes a vertically arranged fixed plate and a turntable, the turntable rotating on the fixed plate via a rotating component;

[0007] A transparent test tube is detachably mounted on the turntable. The test tube clamp is a quick-release clamp, and the opening of the test tube is equipped with a test tube plug. At least one test tube clamp is mounted on the turntable, and the rotation of the turntable causes the test tube to rotate.

[0008] A light emitter and a light receiver are positioned opposite each other on both sides of a test tube. The light emitter and the light receiver are at a horizontal height near the open end of the test tube when it is stationary. The light emitted by the light emitter passes through the test tube and enters the light receiver. The light receiver is electrically connected to a photoelectric converter.

[0009] The optical transmitter, optical receiver, and photoelectric converter are electrically connected to the controller, which is in turn electrically connected to the computer.

[0010] According to the aforementioned novel dry mortar dust suppression performance testing device, a stud connection hole is provided on the test tube clamp, and a turntable stud hole is provided on the turntable. The stud passes through the turntable stud hole, and the test tube clamp is fixedly connected to the turntable through the stud. A nut is provided at the end of the stud away from the test tube clamp, and the nut abuts against the plane of the turntable.

[0011] According to the aforementioned novel dry mortar dust suppression performance testing device, the first bracket and the second bracket are respectively fixed to the fixing plate by screws;

[0012] The first bracket has a through hole at its end, and the light emitter is installed in the through hole of the first bracket;

[0013] The second bracket has a through hole at one end, and the optical receiver is installed in the through hole of the second bracket.

[0014] According to the aforementioned novel dry mortar dust suppression performance testing device, the rotating component includes a base fixed on a fixed plate, a fixed shaft fixed on the base, and a bearing. The inner ring of the bearing is fixedly connected to the fixed shaft, and the outer ring of the bearing is fixedly connected to the turntable.

[0015] A bearing connection hole is drilled through the center of the turntable to mate with the outer ring of the bearing, and the outer ring of the bearing is tightly fitted with the bearing connection hole;

[0016] The mounting plate has mounting plate screw holes; the base has base screw holes on its bottom surface, and the base is fixed to the mounting plate by screws.

[0017] Furthermore, the rotating component also includes a drive motor mounted on the fixed plate and a wheel mounted on the output shaft of the drive motor. The drive motor is fixedly mounted on the fixed plate via a motor support.

[0018] The outer surface of the turntable is provided with first teeth along the circumference, and the rotating wheel is provided with second teeth that cooperate with the first teeth. The first teeth and the second teeth mesh together, and the drive motor runs to drive the rotating wheel to rotate, which in turn drives the turntable to rotate; the drive motor is electrically connected to the controller.

[0019] Furthermore, ribs are provided on the four sides of the base, and the bottom surface of the ribs is fixedly connected to the fixing plate.

[0020] Furthermore, the cross-sectional dimension of the base facing the turntable is larger than the bearing connection hole of the turntable, the fixed shaft extends out of the bearing connection hole of the turntable, and a stop cap is provided at the threaded end of the fixed shaft to confine the turntable between the stop cap and the base.

[0021] The aforementioned novel dry mortar dust suppression performance testing device also includes a support leg fixedly installed at the bottom of the fixed plate for stabilizing the fixed plate.

[0022] This utility model has the following beneficial effects:

[0023] (1) By simulating actual construction conditions, the dry mortar is stirred and then falls freely under gravity. The amount of suspended dust during the fall is used as the basis to quantify the dust suppression characteristics of the dry mortar. This can conveniently, quickly and accurately evaluate the dust suppression performance of the dry mortar and improve the efficiency of the test.

[0024] (2) Since the dry mortar is placed in a sealed test tube, the dry mortar will not come into contact with the light emitter and the light receiver, thus effectively avoiding contamination of the light emitter and the light receiver by the dry mortar and ensuring the detection accuracy. Attached Figure Description

[0025] Figure 1 A three-dimensional view of a novel dry powder mortar dust suppression performance testing device;

[0026] Figure 2 A front view of a novel dry powder mortar dust suppression performance testing device;

[0027] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0028] Figure 4 A top view of a novel dry powder mortar dust suppression performance testing device;

[0029] Figure 5 for Figure 4 Sectional view along the BB direction;

[0030] Figure 6 for Figure 5 A magnified view of a section at point C;

[0031] Figure 7 A three-dimensional view of the fixed plate;

[0032] Figure 8 A 3D view of the turntable;

[0033] Figure 9 A 3D view of the test tube clamp;

[0034] Figure 10 For the three-dimensional rotating parts Figure 1 ;

[0035] Figure 11 For the three-dimensional rotating parts Figure 2 ;

[0036] Figure 12 This is a front view of the rotating component;

[0037] Figure 13 A 3D view of the blocking cap;

[0038] Figure 14 This is a schematic diagram of experimental data from a novel dry powder mortar dust suppression performance testing device.

[0039] In the diagram, 100 is the fixing plate; 101 is the fixing plate screw hole; 200 is the turntable; 201 is the turntable stud hole; 202 is the bearing connection hole; 203 is the first tooth; 300 is the test tube; 400 is the test tube plug; 500 is the test tube clamp; 501 is the stud connection hole; 600 is the stud; 700 is the nut; 800 is the light emitter; 900 is the light receiver; 1000 is the photoelectric converter; 1100 is the base; 1101 is the base screw hole; 1200 is the fixing shaft; 1300 is the stop cap; 1400 is the bearing; 1500 is the drive motor; 1600 is the motor support; 1700 is the rotating wheel; 1701 is the second tooth; 1800 is the first bracket; 1900 is the second bracket; 2000 is the rib plate; 2001 is the rib plate screw hole; and 2100 is the support leg. Detailed Implementation

[0040] To make the technical problem to be solved, the technical solution and advantages of this utility model clearer, the following description will be provided in conjunction with the accompanying drawings. Figures 1 to 14 The specific embodiments are described in detail below.

[0041] This utility model provides a novel dust suppression performance testing device for dry powder mortar, including a vertically arranged fixed plate 100 and a turntable 200, the turntable 200 rotating on the fixed plate 100 via a rotating component.

[0042] A transparent test tube 300 is detachably mounted on the turntable 200 to hold dry mortar. A test tube stopper 400 is provided at the opening of the test tube 300 to seal it after the dry mortar is filled. The test tube stopper 400 is either a wooden stopper or a rubber stopper. At least one test tube clamp 500 is provided on the turntable 200 to secure the test tube 300 and prevent it from falling off the turntable 200 during the experiment. Specifically, the test tube clamp 500 has a stud connection hole 501, and the turntable 200 has a turntable stud hole 201. A stud 600 passes through the turntable stud hole 201, and the test tube clamp 500 is fixedly connected to the turntable 200 via the stud 600. The test tube clamp 500 is a quick-release clamp. Figure 9 As shown. The experimenter rotates the turntable 200, causing the test tube 300 to rotate, thereby dispersing the dry powder mortar inside the test tube 300. A nut 700 is provided at the end of the stud 600 away from the test tube clamp 500, and the nut 700 abuts against the plane of the turntable 200, as shown. Figure 5 As shown.

[0043] The rotation of turntable 200 drives the rotation of test tube 300, thereby agitating the dry powder mortar inside test tube 300.

[0044] A light emitter 800 and a light receiver 900 are fixedly mounted on the fixing plates 100 on both sides of the test tube 300. The light emitter 800 and the light receiver 900 are positioned opposite each other on both sides of the test tube 300. When the light emitter 800 and the light receiver 900 are at a horizontal height near the open end of the test tube 300 in a static state, they can detect suspended dry mortar for a relatively long time. If the light emitter 800 and the light receiver 900 are at a horizontal height away from the open end of the test tube 300 in a static state, some of the deposited dry mortar will block the passage between the light emitter 800 and the light receiver 900, making it impossible to accurately test the dust suppression performance. The light receiver 900 is electrically connected to the photoelectric converter 1000, and the light emitter 800, the test tube 300, and the light receiver 900 are collinear. A first bracket 1800 and a second bracket 1900 are fixedly mounted on a fixed plate 100 to support a light emitter 800 and a light receiver 900, respectively. The first bracket 1800 and the second bracket 1900 are fixed to the fixed plate with screws. A through hole is formed at the end of the first bracket 1800, and the light emitter 800 is installed in the through hole. Similarly, a through hole is formed at the end of the second bracket 1900, and the light receiver 900 is installed in the through hole. The light emitter 800 and the light receiver 900 are positioned at a horizontal height close to the opening of the test tube 300, minimizing the influence of the gravity of the dry mortar during the test and improving the accuracy of the test results. Specifically, the output power of the light emitter 800 is less than 1000 milliwatts. The light emitter 800, the light receiver 900, and the photoelectric converter 1000 are electrically connected to a controller to transmit the light intensity signal. The controller is connected to a computer, where the light intensity signal received by the controller is displayed and further analyzed.

[0045] Specifically, the light emitter 800 is a laser LED or LED, and the light receiver 900 is a phototransistor.

[0046] The rotating components include a base 1100 fixed to a fixed plate 100, a fixed shaft 1200 fixed to the base 1100, and a bearing 1400, such as... Figures 10 to 12 As shown, the base 1100 and the fixed shaft 1200 can be integrally formed. The inner ring of the bearing 1400 is fixedly connected to the fixed shaft 1200, and the outer ring of the bearing 1400 is fixedly connected to the turntable 200. The fixed plate 100 has fixed plate screw holes 101, such as... Figure 7 As shown; a base screw hole 1101 is provided on the bottom surface of the base 1100, as... Figure 10As shown, the base 1100 is fixed to the fixing plate 100 with screws. Ribs 2000 are also provided on the four sides of the base 1100 to strengthen the connection between the base 1100 and the fixing plate 100. The bottom surface of the ribs 2000 is fixedly connected to the fixing plate 100. Similarly, rib screw holes 2001 are provided on the bottom surface of the ribs 2000. The base 1100 and the ribs 2000 are fixed to the fixing plate 100 with screws. A bearing connection hole 202 is provided at the center of the turntable 200 to mate with the outer ring of the bearing 1400. The outer ring of the bearing 1400 is tightly fitted with the bearing connection hole 202. The experimenter rotates the turntable 200 to manually control its rotation, thereby rotating the test tube 300 and agitating the dry mortar inside the test tube 300.

[0047] To reduce the workload of testing personnel, the turntable 200 can be rotated under electric control. Specifically: Figures 1 to 5 As shown, the rotating component also includes a drive motor 1500 mounted on the fixed plate 100 and a rotating wheel 1700 mounted on the output shaft of the drive motor 1500. Specifically, the drive motor 1500 is fixedly mounted on the fixed plate 100 via a motor support 1600. The outer surface of the turntable 200 is provided with first teeth 203 along its circumference, and the rotating wheel 1700 is provided with second teeth 1701 that mesh with the first teeth 203. The first teeth 203 and the second teeth 1701 mesh. The operation of the drive motor 1500 drives the rotating wheel 1700 to rotate, thereby driving the turntable 200 to rotate. The drive motor 1500 is electrically connected to the controller.

[0048] To ensure stable rotation of the turntable 200 on the rotating component, the cross-sectional dimension of the base 1100 facing the turntable is larger than the bearing connection hole 202 of the turntable 200. The fixed shaft 1200 extends beyond the bearing connection hole 202 of the turntable 200, and a stop cap 1300 is threadedly connected to the end of the fixed shaft 1200. The stop cap 1300 is a frustum-shaped cone with a threaded hole at the bottom. The structure of the stop cap 1300 is as follows: Figure 13 As shown, the turntable 200 is confined between the stop cap 1300 and the base 1100, as... Figure 5 As shown, this prevents the turntable 200 from detaching from the rotating component during rotation.

[0049] The experiment revealed that the amount of dry mortar filling significantly affects the final test results; both excessive and insufficient filling lead to inaccurate results. The experiment determined that the optimal filling volume of dry mortar is 1 / 5 of the length of test tube 300. In a specific embodiment, test tube 300 has a diameter of 5cm and a length of 50cm, with graduations spaced 10cm apart. The optimal filling volume of dry mortar in test tube 300 is 10cm, with the light emitter 800 and light receiver 900 positioned at a horizontal height of 30cm on the test tube's graduation mark when stationary.

[0050] The novel dry mortar dust suppression performance testing device also includes a support leg 2100 fixedly installed at the bottom of the fixed plate 100 for stabilizing the fixed plate 100. Specifically, the support leg 2100 is connected to the fixed plate 100 via a slot or bolts.

[0051] Because the dry mortar is contained in a sealed test tube, it will not come into contact with the light emitter and receiver, thus effectively preventing the light emitter and receiver from being contaminated by the dry mortar and ensuring the accuracy of the test.

[0052] Working principle:

[0053] By simulating actual construction conditions, the dry mortar is stirred and then the test tube is stopped rotating at 300 degrees. The dry mortar falls freely under gravity. The amount of suspended dust during the fall is used as the basis for quantifying the dust suppression characteristics of the dry mortar. This method can conveniently, quickly, and accurately evaluate the dust suppression performance of dry mortar and improve the efficiency of testing.

[0054] During testing, first connect the light emitter 800 and light receiver 900 to the power supply. The light receiver 900 is electrically connected to the photoelectric converter 1000. Fix test tube 300 to test tube clamp 500. The computer displays the intensity value of light passing through the air inside test tube 300. Then, remove test tube 300 from test tube clamp 500, open test tube stopper 400, and fill test tube 300 with dry mortar to a depth of 10cm. Replace test tube stopper 400 and place test tube 300 containing dry mortar on test tube clamp 500. The light emitter 800, test tube 300, and light receiver 900 are collinear. After the turntable 200 rotates 2-6 times, return it to its original position. Test tube 300 remains stationary after rotation.

[0055] The light emitter 800 and light receiver 900 work together. The light emitter 800 generates light, and the light receiver 900 receives the light signal passing through test tube 300. According to the Tyndall effect, when light passes through the dry mortar powder suspended in test tube 300, light scattering occurs. By observing whether a light scattering path is visible, it can be determined whether there is suspended dry mortar powder in test tube 300. The light intensity signal obtained by the controller is displayed on the computer for further analysis. When the light emitted by the light emitter 800 passes through the dry mortar in test tube 300, and the test tube 300 rotates and then stops for a short period of time, the light is scattered because the dry mortar powder is dispersed in test tube 300. Observe whether there is a clear "path" in test tube 300. If there is a "path", it means that the dry mortar does not have dust suppression properties; otherwise, it means that the dry mortar has dust suppression properties. Unscattered light is received by the light receiver 900, and the photoelectric converter 1000 converts the received light signal into an electrical signal, which is then transmitted to the controller to form analyzable light information. The computer records the numerical changes in light intensity, and the dust concentration and dust suppression effect of the dry-mix mortar are evaluated based on these changes. Figure 14 As shown, the X-axis can be defined as time, and the Y-axis as light intensity. Light intensity changes over time. The dust suppression effect of dry-mix mortar is judged based on the time taken from the lowest point of light intensity to the point where the light intensity tends to level off. The dust suppression effect of the mortar is graded based on the time it takes for the light intensity to recover to its initial value, as analyzed on a computer. The grading is shown in Table 1. The shorter the recovery time, the better the dust suppression effect of the dry-mix mortar.

[0056] Table 1

[0057] Recovery time / min grade 0-1 1 1-2 2 2-3 3 3-4 4 4-5 5 Greater than 5 6

[0058] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A novel dust suppression performance testing device for dry powder mortar, characterized in that, It includes a vertically arranged fixed plate (100) and a turntable (200), the turntable (200) rotating on the fixed plate (100) by a rotating component; A transparent test tube (300) is detachably mounted on the turntable (200). The test tube clamp (500) is a quick-release clamp. A test tube plug (400) is provided at the opening of the test tube (300). At least one test tube clamp (500) is provided on the turntable (200). The rotation of the turntable (200) drives the test tube (300) to rotate. A light emitter (800) and a light receiver (900) are arranged opposite each other on both sides of a test tube (300). The light emitter (800) and the light receiver (900) are at a horizontal height near the open end of the test tube (300) when it is stationary. The light emitted by the light emitter (800) passes through the test tube (300) and enters the light receiver (900). The light receiver (900) is electrically connected to the photoelectric converter (1000). The optical transmitter (800), optical receiver (900), and photoelectric converter (1000) are electrically connected to the controller, and the controller is electrically connected to the computer.

2. The novel dry powder mortar dust suppression performance testing device according to claim 1, characterized in that, The test tube clamp (500) has a stud connection hole (501), and the turntable (200) has a turntable stud hole (201). The stud (600) passes through the turntable stud hole (201), and the test tube clamp (500) is fixedly connected to the turntable (200) through the stud (600). A nut (700) is provided at the end of the stud (600) away from the test tube clamp (500), and the nut (700) abuts against the plane of the turntable (200).

3. The novel dry powder mortar dust suppression performance testing device according to claim 1, characterized in that, The first bracket (1800) and the second bracket (1900) are respectively fixed to the fixing plate (100) by screws; The first bracket (1800) has a through hole at its end, and the light emitter (800) is installed in the through hole of the first bracket (1800); The second bracket (1900) has a through hole at its end, and the optical receiver (900) is installed in the through hole of the second bracket (1900).

4. The novel dry powder mortar dust suppression performance testing device according to claim 1, characterized in that, The rotating component includes a base (1100) fixed on a fixed plate (100), a fixed shaft (1200) fixed on the base (1100), and a bearing (1400). The inner ring of the bearing (1400) is fixedly connected to the fixed shaft (1200), and the outer ring of the bearing (1400) is fixedly connected to the turntable (200). A bearing connection hole (202) is provided at the center of the turntable (200) to mate with the outer ring of the bearing (1400), and the outer ring of the bearing (1400) is tightly fitted with the bearing connection hole (202); The fixing plate (100) has fixing plate screw holes (101); the base (1100) has base screw holes (1101) on its bottom surface, and the base (1100) is fixed to the fixing plate (100) by screws.

5. The novel dry powder mortar dust suppression performance testing device according to claim 4, characterized in that, The rotating component also includes a drive motor (1500) mounted on the fixed plate (100) and a rotating wheel (1700) mounted on the output shaft of the drive motor (1500). The drive motor (1500) is fixedly mounted on the fixed plate (100) via a motor support (1600). The outer surface of the turntable (200) is provided with first teeth (203) along the circumference, and the rotating wheel (1700) is provided with second teeth (1701) that cooperate with the first teeth (203). The first teeth (203) and the second teeth (1701) mesh with each other. The drive motor (1500) runs and drives the rotating wheel (1700) to rotate, which in turn drives the turntable (200) to rotate. The drive motor (1500) is electrically connected to the controller.

6. The novel dry powder mortar dust suppression performance testing device according to claim 4, characterized in that, Ribs (2000) are also provided on the four sides of the base (1100), and the bottom surface of the ribs (2000) is fixedly connected to the fixing plate (100).

7. The novel dry powder mortar dust suppression performance testing device according to claim 4, characterized in that, The cross-sectional dimension of the base (1100) facing the turntable (200) is larger than the bearing connection hole (202) of the turntable (200). The fixed shaft (1200) extends out of the bearing connection hole (202) of the turntable (200). The end of the fixed shaft (1200) is threaded with a stop cap (1300) to limit the turntable (200) between the stop cap (1300) and the base (1100).

8. The novel dry powder mortar dust suppression performance testing device according to any one of claims 1 to 7, characterized in that, It also includes a support leg (2100) fixedly installed at the bottom of the fixed plate (100) for stabilizing the fixed plate (100).

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